going lean when "punching" gas pedal. files attatched:
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Joined: Apr 2003
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From: Cenral Valley, CA, U.S.A.
going lean when "punching" gas pedal. files attatched:
i'm still playing with my tune, but i have a problem i can't solve:
while accelerating from a stop or at low RPM, when i give the car a decent amount of throttle, the car "misses" or stumbles before accelerating. while watching the wideband, i can see it go lean for a bit. it appears on the datalog.
while driving:
2:10.441
2:16.389
2:34.952
4:24.918
here, i stabbed at the throttle while driving to provoke the lean condition:
5:24.085
5:26.710
5:28.088
details:
stock B18C5
Hondata S300
630cc injectors
turbo kit, blah blah.
all else is stock
Walbro fuel pump
what has changed:
valve job
switched from JDM to USDM pistons.
switched from -6 fuel feed line to -> line that goes from -4 (1/4"), from fuel pump, to -6 under car, then back to the steel -4 line on firewall. (all due to repairs).
switched from after market fuel filter to OEM.
switched from STR fuel rail to stock.
switched to smaller intercooler.
hondata tune:
http://mywebpages.comcast.net/kaj7502/tune.skl
datalog:
http://mywebpages.comcast.net/kaj7502/fwy.s2d
anyone have an idea?
so far i've tried adding fuel to the tip-in trim.. no help. i've re-added the 2% fuel trim the tuner had in cyls 2 and 3.. no help.
it doesn't matter what rpm i'm at, what vacuum/boost, etc... i have a sick stumble when stabbing the gas pedal.
any help would be appreciated. thanks
Modified by kaj at 11:42 AM 10/30/2006
Modified by kaj at 2:14 PM 10/30/2006
while accelerating from a stop or at low RPM, when i give the car a decent amount of throttle, the car "misses" or stumbles before accelerating. while watching the wideband, i can see it go lean for a bit. it appears on the datalog.
while driving:
2:10.441
2:16.389
2:34.952
4:24.918
here, i stabbed at the throttle while driving to provoke the lean condition:
5:24.085
5:26.710
5:28.088
details:
stock B18C5
Hondata S300
630cc injectors
turbo kit, blah blah.
all else is stock
Walbro fuel pump
what has changed:
valve job
switched from JDM to USDM pistons.
switched from -6 fuel feed line to -> line that goes from -4 (1/4"), from fuel pump, to -6 under car, then back to the steel -4 line on firewall. (all due to repairs).
switched from after market fuel filter to OEM.
switched from STR fuel rail to stock.
switched to smaller intercooler.
hondata tune:
http://mywebpages.comcast.net/kaj7502/tune.skl
datalog:
http://mywebpages.comcast.net/kaj7502/fwy.s2d
anyone have an idea?
so far i've tried adding fuel to the tip-in trim.. no help. i've re-added the 2% fuel trim the tuner had in cyls 2 and 3.. no help.
it doesn't matter what rpm i'm at, what vacuum/boost, etc... i have a sick stumble when stabbing the gas pedal.
any help would be appreciated. thanks
Modified by kaj at 11:42 AM 10/30/2006
Modified by kaj at 2:14 PM 10/30/2006
Honda-Tech Member
Joined: Jan 2006
Posts: 87
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From: Houston, TX, US
Re: (kaj)
Might have something to do with your fuel line going from small to bigger to small again. Best thing to do would be to put a pressure sending unit after the filter and datalog the fuel pressure via Hondata.
Thread Starter
Honda-Tech Member
Joined: Apr 2003
Posts: 2,904
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From: Cenral Valley, CA, U.S.A.
Re: (FourDoorLS)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FourDoorLS »</TD></TR><TR><TD CLASS="quote">Might have something to do with your fuel line going from small to bigger to small again. Best thing to do would be to put a pressure sending unit after the filter and datalog the fuel pressure via Hondata.</TD></TR></TABLE>
that was my first thought. i could run the same-size line all the way under the car but i kept the -6 portion because it's all aeroquip stuff and more resistant to abrasion
maybe i'll run the smaller line and see how it works.
that was my first thought. i could run the same-size line all the way under the car but i kept the -6 portion because it's all aeroquip stuff and more resistant to abrasion
maybe i'll run the smaller line and see how it works.
Thread Starter
Honda-Tech Member
Joined: Apr 2003
Posts: 2,904
Likes: 0
From: Cenral Valley, CA, U.S.A.
Re: (JDM_Ej)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_Ej »</TD></TR><TR><TD CLASS="quote">Could be a MAP sensor issue. </TD></TR></TABLE>
not sure. it worked fine before, but i suppose it never hurts to double check it. i'll add it the list of stuff to check tonight.
not sure. it worked fine before, but i suppose it never hurts to double check it. i'll add it the list of stuff to check tonight.
Thread Starter
Honda-Tech Member
Joined: Apr 2003
Posts: 2,904
Likes: 0
From: Cenral Valley, CA, U.S.A.
could it just be due to the fact that i'm, basically, using the stock -4 line instead of -6? plus i'm going through the stock filter and line, instead of my aftermarket stuff.
if so, where would i make the change in my tune? somewhere in the trim section? the tune is right on at any other time.
if so, where would i make the change in my tune? somewhere in the trim section? the tune is right on at any other time.
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